O 21-class submarine

	HNLMS O 21
Class overview
Name	O 21 class
Builders	Rotterdamsche Droogdok Maatschappij (4); Koninklijke Maatschappij De Schelde (2); Wilton-Fijenoord (1);
Operators	Royal Netherlands Navy; Kriegsmarine;
Preceded by	O 19 class
Succeeded by	Dolfijn class
Built	1937–1940
Completed	7
Lost	2
Scrapped	5
General characteristics
Type	Submarine
Displacement	990 tons surfaced; 1205 tons submerged;
Length	77.7 m (255 ft)
Beam	6.8 m (22 ft)
Draught	3.95 m (13 ft)
Propulsion	2 × Sulzer 7QD42 7-cylinder diesel engines, 2,500 bhp (1,864 kW) each; 2 × 500 bhp (373 kW) electric motors;
Speed	19.5 kn (36.1 km/h; 22.4 mph) surfaced; 9 kn (17 km/h; 10 mph) submerged;
Range	10,000 nmi (19,000 km; 12,000 mi) at 12 kn (22 km/h; 14 mph) surfaced; 28 nmi (52 km; 32 mi) at 8.5 kn (15.7 km/h; 9.8 mph) submerged;
Complement	39
Armament	8 × 21 in (530 mm) torpedo tubes (4 bow, 2 stern, 2 traversing amidships )

The O 21 class was a class of seven submarines, built for the Royal Netherlands Navy. The boats were still incomplete at the start of the German invasion of the Netherlands O 21, O 22, O 23 and O 24 were hastily launched and escaped to the United Kingdom. O 25, O 26 and O 27 were not able to escape and were captured by the German forces. The Kriegsmarine ordered the completion of the boats and they entered German service as UD-3, UD-4 and UD-5. The submarines' diving depth was 100 meters (330 ft).

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